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Liquid crystal composition and liquid crystal display device

a liquid crystal display and composition technology, applied in the field of liquid crystal compositions, can solve the problems of long service life of the device, and achieve the effects of small viscosity, large specific resistance, and high stability of the polymer

Active Publication Date: 2013-05-30
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a new liquid crystal composition that is stable to both ultraviolet light and heat. It has various advantages such as high stability, high maximum temperature, low minimum temperature, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, and high stability to ultraviolet light and heat. The composition can be used in liquid crystal displays and polymerizable compounds with these properties can be used in various applications such as an AM device with a short response time, a suitable pretilt angle, and a high voltage holding ratio. Additionally, the invention provides a liquid crystal display device that has a high stability and long service life.

Problems solved by technology

A large absolute value of dielectric anisotropy in the composition contributes to a low threshold voltage, a small electric power consumption and a large contrast ratio in the device.
In the case where the stability is high, the device has a long service life.

Method used

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  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

example 1

Comparison of Solubility in Liquid Crystal Composition 1

[0118]As a comparison, 1 part by weight of polymerizable compound (R-1) was added to 100 parts by weight of liquid crystal composition A, and dissolution was attempted at 25° C., but crystals remained in the liquid crystal composition and the compound did not wholly dissolved.

[0119]When 1 part by weight of polymerizable compound (1-1-1-1) of the invention was added to 100 parts by weight of liquid crystal composition A, and dissolution was attempted at 25° C., a whole amount of compound (1-1-1-1) was dissolved. The comparison shows that the compound of the invention is more easily dissolved in the liquid crystal composition. The results are shown in Table 3. In expressions in Table 3, “good” indicates no finding of crystals, and “bad” indicates finding of crystals. Components and ratios of liquid crystal composition A were as described below.

TABLE 3Comparision of Solubility in Liquid Crystal CompositionSolubility(2 days, roomFo...

example m1

[0156]

V-HB(2F,3F)-O2(2-1-1)15%V-HB(2F,3F)-O4(2-1-1)10%2-HBB(2F,3F)-O2(2-8-1)4%3-HBB(2F,3F)-O2(2-8-1)10%5-HBB(2F,3F)-O2(2-8-1)10%2-HHB(2F,3CL)-O2(2-9-1)2%3-HHB(2F,3CL)-O2(2-9-1)3%4-HHB(2F,3CL)-O2(2-9-1)3%5-HHB(2F,3CL)-O2(2-9-1)3%2-HH-3(3-1-1)27%3-HB-O2(3-2-1)2%3-HHB-1(3-5-1)3%3-HHB-3(3-5-1)5%3-HHB-O1(3-5-1)3%

[0157]To 100 parts by weight of the composition, 0.3 part by weight of compound (1-1-1-1) as a first component of the invention was added.

MAC-VO-BB-MAC(1-1-1-1)

[0158]Characteristics of the composition were as described below.

[0159]NI=74.3° C.; Tc<−20° C.; Δn=0.095; Δ∈=−3.1; Vth=2.13 V; VHR-1=99.2%; VHR-2=98.2%; VHR-3=98.3%.

Method for Preparation of a Liquid Crystal Display Device

[0160]An aligning agent was coated onto two glass substrates with ITO electrodes by means of a spinner, and a film was formed. After the coating, heating and drying were carried out at 80° C. for approximately 10 minutes, and heat treatment was carried out at 180° C. for 60 minutes, and thus an alignment ...

example m2

[0162]

3-H2B(2F,3F)-O2(2-2-1)17%5-H2B(2F,3F)-O2(2-2-1)16%3-HHB(2F,3F)-O2(2-5-1)7%3-HBB(2F,3F)-O2(2-8-1)5%4-HBB(2F,3F)-O2(2-8-1)6%5-HBB(2F,3F)-O2(2-8-1)10%2-HH-3(3-1-1)20%3-HH-4(3-1-1)4%5-HB-O2(3-2-1)4%3-HHB-1(3-5-1)4%5-HBB(F)B-2(3-13-1)7%

[0163]To 100 parts by weight of the composition, 0.3 part by weight of compound (1-1-1-1) as a first component of the invention was added.

MAC-VO-BB-MAC(1-1-1-1)

[0164]Characteristics of the composition obtained were as described below.

[0165]NI=76.8° C.; Tc<−20° C.; Δn=0.099; Δ∈=−3.1; Vth=2.36 V; VHR-1=99.1%; VHR-2=98.5%; VHR-3=98.6%.

[0166]A response time of the liquid crystal display device prepared according to the method described in Example M1 was as described below: τ=4.6 ms.

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Abstract

To provide a highly reactive polymerizable compound having a high solubility in a liquid crystal compound; a liquid crystal composition satisfying at least one characteristic such as a high maximum temperature of a nematic phase, a low minimum temperature thereof, a small viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy and specific resistance, a high stability to ultraviolet light and heat, and having a suitable balance regarding at least two characteristics; a PSA device having a short response time, a large pretilt angle, a small residual monomer concentration, a large voltage holding ratio and contrast ratio and a long life; a polymerizable compound into which one bonding group or nonidentical reaction group is introduced by constructing a polymer structure having a high polymerization degree in a PSA device manufacturing process to obtain a stable display, a liquid crystal composition containing thereof, and a liquid crystal device including thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority benefit of Japan application serial no. 2011-259029, filed on Nov. 28, 2011, and 2012-089083, filed on Apr. 10, 2012. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification.TECHNICAL FIELD[0002]The invention relates to a liquid crystal composition containing a polymerizable compound that is polymerized, for example, by light or heat. The invention also relates to a liquid crystal display device in which the liquid crystal composition is sealed between substrates, and the polymerizable compound contained in the liquid crystal composition is polymerized while adjusting a voltage applied to a liquid crystal layer to immobilize alignment of liquid crystals.[0003]As the technical field of the invention, the invention relates to a liquid crystal composition mainly suitable for use in an active matrix (AM) device and so ...

Claims

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Application Information

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IPC IPC(8): C09K19/30G02F1/13C09K19/34
CPCC09K19/14C09K19/20C09K19/32C09K2019/0448C09K2019/122C09K2019/3078C09K2019/301C09K2019/3016C09K2019/3021C09K2019/3025C09K2019/3071C09K2019/123
Inventor GOTOH, YASUYUKIFUJITA, YUKIHIROYANAI, TAKAYOSHIHATTORI, NORIKATSU
Owner JNC CORP
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